Reabsorção radicular interna: desenvolvimento de metodologia e avaliação de métodos de remoção de hidróxido de cálcio

• Ano de defesa: 2018
• Autor(a) principal: Silva, Bruno Marques da
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Positivo; Brasil; Pós-Graduação; Programa de Pós-Graduação em Odontologia Clínica; UP
• Palavras-chave em Português: Odontologia; Endodontia; Reabsorção óssea; Hidróxido de cálcio; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.cruzeirodosul.edu.br/handle/123456789/2156

The objective of this research was to evaluate the efficacy of 3 methods to remove of calcium hydroxide paste in simulated internal root resorption (IRR) cavities; to analyze 2 methods for creation IRR in vitro and to evaluate 2 methods of evaluation - optical microscopy (OM) and scanning electron microscopy (SEM) - in the visualization of calcium hydroxide remaining in the simulated IRR. For this, 82 upper central incisors with single root canal were selected. The teeth were shaping with Reciproc R50, splitted longitudinally and simulated IRR cavities were created 5 mm from the apex with a 1016 spherical diamond bur. Twelve teeth were submitted to a demineralization protocol with 5% and 20% nitric and analyzed through MEV to verify the creation of irregularities within the IRR. The specimens were joined with cyanoacrylate gel glue. Five teeth were left empty (Negative Control) and five teeth were filled with calcium hydroxide paste and were not submitted to any irrigation protocol (Positive Control). The remaining samples were divided into 5 groups (n = 12) according to the instrument used for activate solutions: Ultrasound, EndoActivator , Eddy, XP endo Finisher and XP endo Shaper. The teeth were cleaved and submitted to OM analysis (20X magnification) and SEM (100X magnification). The IRR cavities of the 60 teeth were cleaned and submitted to a 20% nitric acid demineralization protocol, and the methods for agitating irrigants was repeated as well as microscopic analysis. The analysis of the images of calcium hydroxide remaining in the simulated IRR cavities after irrigation was performed by two calibrated examiners, following a previously established score in the literature and the Kappa test was performed (concordance level greater than 90%). Kruskall Wallis tests were performed for comparison between the groups and Mann Whitney for peer evaluation (significance level 0.05). The Wilcoxon test was performed for evaluation between cavity creation (bur/acid) methods and evaluation methods (OM/SEM). There was a significant difference in the efficacy of the instruments in relation to the cavity creation method as well as to the evaluation methods (p0.05). The XP endo Finisher and Eddy groups were more efficient in the removal of calcium hydroxide when the IRR were created with the aid of the acid protocol and analyzed by SEM.